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Phys. Rev. A 71, 013414 (2005) [5 pages]

3He polarization-dependent EPR frequency shifts of alkali-metal– 3He pairs

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Earl Babcock1, Ian A. Nelson2, Steve Kadlecek3, and Thad G. Walker1
1Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA
2Department of Human Oncology, University of Wisconsin Medical School, Madison, Wisconsin 53792, USA
3Department of Radiology, University of Pennsylvania, Philadelpia, Pennsylvania 19104, USA

Received 8 September 2004; published 19 January 2005

We present temperature-dependent measurements of the EPR frequency shifts for Na, K, and Rb interacting with polarized 3He . K and Na frequency shifts were measured via comparison with Rb frequency shifts (well known at low temperatures) in Na-Rb-3He and K-Rb-3He spin-exchange cells. The lowered Rb vapor pressure of these “hybrid” spin-exchange cells also allowed us to extend the measured temperature dependence of the Rb EPR frequency shifts up to 350  °C . This work presents measurements of the EPR frequency shift for Na in 3He and significantly extends the temperature range of previous Rb and K EPR frequency shift measurements. These results are critical to the performance of accurate 3He EPR polarimetry in spin-exchange cells.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.71.013414
DOI: 10.1103/PhysRevA.71.013414
PACS: 32.80.Bx, 32.30.Dx, 33.25.+k, 33.35.+r

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